Siphon is a revolutionary tool that became the first VoIP/SIP application for the iPhone and iPod Touch platforms.

Siphon works with headset enabled devices and comes with complete support for the SIP standard, thus preserving compatibility with a large number of SIP providers.

On top of that, Siphon also offers a GUI that retains the original design of iPhone applications. In order to install the application on your phone you need to drag and drop it and the .mobileprovision file to your iTunes library. After this step is performed you must select the device, check synchronize applications and install the app.

The application is localized to multiple languages, such as Russian, German, Danish, Croatian, Chinese, Spanish and Italian, among others.

The SiphonSettings.bundle package must be installed on iPhone in this directory: /System/Library/PreferenceBundles, so, if you need to change any settings, you can easily access them in a snap.

The application works with multiple SIP providers from the whole world, which includes anatel, arcor, eutelia or others.

Siphon includes complete support for the SIP standard and keeps compatibility with hundreds of SIP providers. Not only that, but it also offers a GUI which preserves the original Apple design.